Gauge for setting box tool blades



Feb. 11, 1947. EDENBERG 2,415,474

GAUGE FOR SETTING BOX TOOL BLADES Filed June 17, 1943 2 Sheets-Sheet 1 lNVENTOR. 12m .4:

BYM

Feb. 11, 1947.

A. A. EDENBERG 2,415,474

GAUGE FOR SETTING BOX 'rdoL BLADES 2 Sheets-Sheet 2 Filed June 1'7, 1943 Patented Feb. 11, 1947 UNITED STATES FATENT OFFICE '9 Claims.

This invention relates to power tools, and more particularly to gauges for use in setting box tool blades to be used in automatic screw machines.

One of the objects of the invention is the provision of a new and improved gauge whereby blades for box tools may be set in their boxes with substantial accuracy and with a minimum expenditure of time and labor.

Another object of the invention is the provision of a new and improved gauge for use for setting blades for turning a single diameter that consists of a single piece and with no moving parts.

Another object of the invention is the pro vision of a new and improved gauge for setting blades for box tools that is provided with a novel adjustment for setting the blades for turning various diameters.

A still further object of the invention is the provision of a new and improved gauge of such construction that a novice can set the blade in a box tool with substantial accuracy in afew seconds of time.

A further object of the invention is the provision of a new and improved gauge that is inexpensive to manufacture, that is simple in construction, and that occupies a minimum of space when not in use, and that may be used by the novice almost as well as by the expert machinist.

Other and further objects and advantages of the invention will be apparent from the following description, taken in connection with the accompanying drawings, in which Fig. 1 is a perspective view of a box tool with the gauge in position therein;

Fig. 2 is a perspective view of the gauge with a box tool blade shown in adjusted position on the gauge;

Fig. 3 is a section on the line 3-3 of Fig. 2;

Fig. 4 is a perspective view of a different form of box tool, showing a modified form of gauge in position therein for setting the box tool blade;

Fig. 5 is a perspective view of the gauge shown in Fig. 4;

Fig. 6 is a view similar to Fig. 5, on an enlarged scale and with parts broken away;

Fig. '7 is a view similar to Fig. 4, but showing a scale in the box tool for positioning the gauge therein; p

Fig. 8 is a perspective view of a modified form of gauge; and

Fig. 9 is a side view of the construction shown in Fig. 8.

In automatic screw and like machines, in which turret-s are employed for carrying the different tools required in the various operations, it is common practice, and is considered advisable by the manufacturers, that in the setting of blades in the box tools the operator make trial cuts in making the proper setting for the blades.

It is necessary, in operating screw machines, that the blades be removed and sharpened frequently, and after they have been sharpened it is necessary to reset them in the box too-l. Heretofore it has been customary to depend on trial and error for setting these blades. Such an arrangement results in a considerable loss of time, especially where the operator is not one of long experience. The present invention seeks to provide a gauge whereby the blades may be set accurately and with the expenditure of a minimum amount of time and labor.

Referring now to the drawings, the reference character Ill designates a box tool of the conventional type of smaller size, and which is adapted. to be used in a turret screw machine. This tool comprises a body portion ll, having a shank l2 extending rearwardly therefrom and by means of which the tool is secured in position in the turret in the usual manner. The body portion II has what, for convenience of description, will be termed its front face l3, inner side face 14, and outer side face I l vertically disposed, as shown in Fig. 1. The body portion ll has at its lower end a lateral extension I5, which is provided with a curved recess or seat It which functions as a rest or seat for the work while the same is being turned.

The shank portion 12 is provided with an axial opening 12 shown in dotted lines in Fig. 1, which is coaxial with the curved recess or rest l6 and extends entirely through the shank. This opening is of slightly less diameter than the diameter of the rod from which the turned article is made. The body portion II is also provided with a rectangular recess I! extending through the same through the inner face of the tool M at an angle to the opening 12*, as is usual in such construe tion. Extending across this recess from the front toward the rear of the box tool is a fulcrum pin or rocker H! on which the outer end portion of the blade 20 is adapted to rest. A set-screw 2| on the upper face of the body portion l4, and a second set-screw 22' on the lower face thereof, are adapted to extend into the opening IT for clamping the blade in position against the rocker [9. The set-screw 22 is closer to the planeof the face l4 than the set-screw 2|, and by' adjusting these screws the height of vthe cutting edge of the blade may be adjusted.

Since the box tool thus far described is conven- 3 tional in the art, it is not thought necessary to further illustrate or describe the same.

The gauge employed for setting the box tool blades will now be described. The gauge is shown at 25 and comprises a body portion 26, circular in cross-section but slightly smaller in diameter than the axial opening 23 through the shank I2, so that the same will form a snug fit when inserted in the shank.

Each end of the body portion 26 has a segment removed to form what may be termed the head of the gauge. Since the gauge heads at the ends of the gauge are duplicates of each other, except that one is for a right hand and the other for a left hand box tool, only one need be described.

Referring now to Fig. 3 of the drawings, which shows the gauge head enlarged and in which the vertical diameter is shown at DE and the horizontal diameter at AB, with C as the center of the article, a segment DC'F is removed. The line CF is perpendicular to the line DE, and is parallel to AB. The distance between the line '1 and AB constitutes the radius of the finished article after the turning operation. Beginning at a point G on the surface indicated by the line CF, this surface is beveled off so that the head portion forming the gauge will contain the lines DC'G and GB. The beveled portion provides clearance for the box tool blade. The ledgeZl between CG is extremely narrow, not much more than .005" in Width, and constitutes a rest for the sharpened edge of the tool when the same is being set, as shown in Fig. 2 of the drawings.

- In the setting of blades in the box tool it is necessary that the cutting blade should be set on center, as otherwise the diameter of the turned article will exceed the required diameter or be less than the required diameter. In setting the blade with the aid of the present invention the gauge is inserted in the axial opening of the shank I2 from the rear of the box tool and pushed through until the ledge portion 21 of the head of the gauge is directly beneath the position that the blade will take when it is inserted, and is so adjusted that the flat face or abutment wall DC is parallel with the face I 4.

If desired each end of the gauge may be provided with a line 28 across the same, in vertical alinement with the abutment Wall DC, and in the vertical diameter of the gauge. The box tool is likewise provided with a vertical line 33 below the seat [6, parallel with the face [4 and in a Vertical plane through the axis of the shank opening. When the gauge i employed for setting a blade the lines 28, 33, are caused to aline, as shown in Fig. 1. In box tools not having the line 33 it is only necessary for the operator to turn the gauge so that the abutment wall DC of the gauge is parallel with the inner side face 14 of the box tool before the insertion of the blade.

After the gauge is positioned within the box tool the blade 20 is inserted and is advanced until theadvanced portion of the cutting edge rests on the ledge 21 against the abutment wall or face DC. The set-screws 21, 22, are then tightened. Thereafter the set-screw 2| may be released just suflicient to permit the removal of the gauge 25; and then retightened, and the box is ready to be inserted in its position in the turret. The size and threads per inch may be stamped on a fiat portion 20. V

The gauge 25 is for a single turning diameter, but the form of construction shown in Figs. 4, 5, 6 and '1 illustrates means for setting the bladev for turning articles of different diameters. In this 4 form of construction the gauge 34 is circular in cross-section, as in the previous construction, and is provided with a flattened portion 35, intermediate its ends. The flattened portion 35, in this form of construction, is in the horizontal plane of the axis, as indicated by the line 50 between the end portions of the gauge, and the inner end of the gauge is of reduced diameter for the reason that this gauge is intended to be inserted from the front of the tool rather than from the back thereof, as in the previous construction. The outer terminus of this flattened portion 35 is of the same diameter as the main body of the gauge and constitutes an abutment wall for the blade when setting the same. It

, corresponds to the wall DC of the form shown in Fig. 3.

The box tool 39 differs from the box tool In in that it is larger and is provided on its under side with a pair of adjustable members 4|, only one of which is shown, which may be provided with rollers for forming a V rest for the article to be turned, corresponding to the curved recess IS in the box tool HI. These rest members are removed, or at least adjusted away from the gauge, during the blade setting operation to provide clearance for the gauge blade. In this form of box tool the body portion 42 of the tool is provided with a shank 43, having an axial opening 44 therein, which arrangement is substantially the same as that described above.

The front face of the box tool is provided with a pair of forwardly extending projections 45, 46, spaced apart for receiving the blade 41 therebetween. The blade rests on a rocker member 63, which is rotatably received in a corresponding curved seat or recess 49 in the projection The tool rests on the rocker 48, and is adjusted angularly by turning it and the rocker and holding the blade in adjusted position by a pair of set-screws 5|, 52, on opposite sides of the rocker. Since the details of the box tool are old and well known in the art, it is not thought necessary to further illustrate or describe the same.

Suitable adjusting means are provided on the gauge for positioning the blade for turning different diameters. In the form of construction selected to illustrate one embodiment of the invention, the body portion 53 of the gauge 34 is provided with a slot 54, the lower marginal wall of which is in alinement with the wide flattened portion 35 of the gauge. At the closed end of the slot an opening 55 extends transversely through the body portion 53 in the plane of the slot, and is adapted to slidably receive a guide 56 to which is rigidly connected a blade 51, slidable in the slot 54. The blade 51 is rigidly secured to the guide 56, and each end of the blade is beveled olf to form a narrow ledge 58 and to provide clearance for the turning blade in setting the same, as will presently appear. The length of the blade 51, which extends transversely to the body portion 53, is equal to the diameter of the body portion 53. A set-screw 59 is providedfor engaging the guide 56 for holding the blade in adjusted position to either side of the body portion 34, for gauging turning blades for right and left hand box tools.

For accurate work the blade 51 is adapted to be set or adjusted by a micrometer, not shown. In setting the micrometer preparatory to setting the turning blade, it is only necessary to subtract the radius of the proposed finished turned product from the radius of the body portion, which will give the distance between 58a andtl. Now add this to the width of the blade 51. Then place the anvil of the micrometer on the ledge-'58 and adjust the blade until the spindle engages the edge 6! of the gauge, after which the set-screw 59 is set. In other words, adjust the micrometer so that the distance between the edge 58 and the center line 50 is the radius -of the desired turned product. If only fairly accurate measurements are sufficient, the scale 6E1 on blade 51 may be employed. All that is necessary is to set the blade so that the scale read on the center line 50 is thedesired radius. 7 When the desired adjustment is made the set-screw 59 is turned for holding the guide member 56 in adjusted position. After this adjustment has been made the tool is ready for use .in the box tool.

In using the gauge the same is inserted from the front side of the body into the opening 44 in the shank, as shown in Fig. 4. After the gauge is inserted a scale 62 may have its edge laid on the face of the projection 45, as shown in Fig. '7, and is brought into contact with the flat face 35 of the gauge for positioning the same. If desired, registering marks may be made on the gauge and on the box tool for positioning the gauge, similar to that described above. After the gauge has been positioned the scale 62 is removed, the rocker 49 and turning blade 41 inserted, and the cutting edge is supported on the ledge 58 of the blade 51, after which the set-screws l, 52, are properly adjusted for holding the turning blade in this position.

The outer end of the body portion of the gauge may be provided with a -.\l groove 63 having the line common to the planes of both of its fiat sides extending longitudinally of the gauge in a'plane parallel with the flat portion 35, as shown more clearly in Fig. 5 of the drawings. The groove 63 provides a clearance for the cutting edge of the turning blade in withdrawing the gauge after it has been secured in position. If desired, the inner end of the body portion of the gauge may be provided with a handle in the form of a cross bar 64 for inserting and removing the gauge in the box tool.

In Figs. 8 and 9 is shown a further modified form of gauge having means for varying the diameter of the article to be turned. In this form of construction the gauge 65 is provided with a body portion 66, as in the previous construction, and at one end a quadrant is removed, forming a vertical wall Ill and a horizontal wall 61. The lower portion is provided with a slot 68 in the plane of the wall 10, the bottom wall of which is on an incline toward the periphery of the body portion, as shown by dotted lines at 69 in Fig. 9. An adjusting blade 'II is adapted to slidably engage the slot, as shown in Fig. 9, and the lower edge of this blade is inclined in the opposite direction, to correspond with the inclined surface 69 of the slot 68 of the gauge. As a result of this arrangement it will be noted that when the blade H is pulled outwardly toward the dotted line position 12 shown in Fig. 9, the uppersurface 13 of the blade will remain parallel with the axis of the gauge. A suitable setscrew 14 is provided for holding the gauge in its adjusted position. The upper edge of this blade is beveled, so that it will form a very narrow ledge for engaging the tool box blade in adjusted position more accurately, as in the constructions already described. The wall 61 may 0 r in l) be beveled, if desired, to provide clearance for the tool blade.

In positioning the blade H the micrometer may be used as in the previous construction. Since the face -61 is in the plane of the horizontal diameter of the gauge, the distance betweenlthe upper edge of the blade 13 and the flat face 61 of the gauge will indicate the position of the tool blade for turning an article having a'radius equal to the distance between the face 6-! and the edge 73. In using this device it is inserted in the box tool in the manner shown in either Figs. 4 or '7, with the wall 10 parallel with the side wall M of the box tool.

In using the gauge the blade H is first .adjusted and locked in position, after which the gauge is inserted in the box tool in the manner shown in Fig. 1. Thereafter the box .tool blade is inserted in the box tool until the edge engages the wall 18 and rests on the beveled edge of the blade H. The box tool blade is then secured in position and the gauge removed.

It is thought from the foregoing, taken inconnection with the accompanying drawings, that the specification and construction of my device will be apparent to those skilled in the art, and that changes in size, shape, proportion and details may be made without departing from the spirit and scope of the appended claims.

I claim as my invention:

1. A gauge for setting a blade in a box tool comprising a bar having a body portion circular in cross-section and of a diameter to slidably engage in the shank of said box tool with a close fit, said gauge having a flat portion in the plane just beneath said blade and parallel with the axis of said gauge and spaced from said axis a distance substantially equal to one-half of the diameter of the article to be turned by said blade, and'means for limiting the advance position of the blade.

2. A gauge for setting a turning blade in its box tool comprising a bar having a circular end portion adapted to fit snugly in the axial opening in the shank of a box tool and having an extension of the same diameter adapted to be seated in the body portion of the box tool, said extension having a horizontal portion parallel with the horizontal plane of the axis of the bar and spaced therefrom a distance equal to the radius of the turned article and means carried by said gauge for indicating the proper longitudinal adjustment of said blade prior to clamping the same in operative position in said box tool.

3. A gauge for setting box tool blades comprising a circular body, one end of which has a segment removed to form a vertical wall on the radius, and a narrow ledge spaced from the axis of the body portion and having its face perpendicular to said vertical wall and having the space immediately beneath the plane of said ledge beveled off to provide a clearance for the box tool blade while setting the latter.

4. A gauge for setting a turning blade in a box tool of a screw machine, comprising a cylindrical body member adapted to be inserted and form a close fit in the work receiving bore of said tool and having a portion removed forming an abutment wall in the plane of the axis of said body portion for limiting the inward movement of a turning blade while setting the same, and a turning blade support contiguous to said abutment wall for supporting the inner end of a turnin blade while setting the same in a box tool, said end forming an abutment wall in the plane of the axis of said body portion, a narrow gauge ledge contiguous to said wall and spaced from the axis of said body portion a distance equal to the radius of the turned article, the wall outwardly from said ledge being inclined to provide clearance in setting the turning blade, and means for adjusting said gauge ledge radially of said gauge.

6. A gauge for setting a turning blade in a box tool of a screw machine, comprising a cylindrical body member having a portion removed at one end forming an abutment wall in the plane of the axis of said body portion, and a blade parallel with said wall and adjustably transversely to the axis of said body member to form a supporting ledge for setting a box tool blade.

'7. A gauge for setting a turning blade in a 'box tool'of a screw machine, comprising a cylindrical body member having a portion removed at one end forming anrabutment wall in the plane of the axisof said body portion, said gauge having a slot provided with an inclined bottom wall in said gauge parallel with said abutment wall and contiguous thereto, and a gauge bladehavingan inclined edge engaging the inclined bottom wall of said slot wherebywhen saidblade is moved outwardly its free edge will be moved radially out- .wardly for forming a gauge for setting a turning tool blade, and means for holding said gauge 7 blade in adjusted position. A

8. A gauge for setting a box toolblade comprising a 'cylindrical portion having a flat face thereon forming an abutment wall in the vertical-plane;of the axis of said cylindrical portion forlimiting the inward movement of a turning blade during the operation of setting the same in abox tool, said cylindrical portion being adapted to be inserted and form a close fit in the work receiving bore of said tool, means associated with said flat face for forming a blade supporting ledge spaced radially from the axis of said cylindrical portion and adjacent said flat face, and means for indicating the blade setting position of said flat face. Y

9. A gauge for setting a turning blade in a box tool for a screw machine, comprising a body member having one end portion cylindrical and of a diameter adapted to be inserted and form a close fit in the work receiving bore of said holder and having a portion removed for forming an abutment wall in the vertical plane of the axis of the cylindrical portion, and a blade supporting ledge adjustable relative to said wall, said wall and ledge adapted to position a turning blade while the same is being set in said box tool.

ALBIN A. EDENBERG.

REFERENCES CITED UNITED STATES PATENTS Number Name Date 624,535 Powel May 9, 1899 1,415,339 Hall May 9, 1922 2,043,613 Hane June 9, 1936 424,979 Hartness Apr. 8, 1890 1,895,191 Jones Jan. 24, 1933 FOREIGN PATENTS Number Country Date 296,114 German Jan. 13, 1917 443,943 German May 6, 1927 

